Fire retardant thermoplastic polyester and polyesterether compositions

Abstract

Thermoplastic polyester and polyesterether compositions having improved flame retardance, smoke generation and heat aging, reduced blooming and superior high temperature processability comprise a thermoplastic polyester or polyesterether resin derived from 1,4-butanediol and dimethyl terephthalate, antimony oxide, optionally fiberglass, and a chlorinated bisimide of the formula ##STR1##

What is claimed is: 
     
       1. A non-blooming flame retardant thermoplastic polyester composition comprising (a) from about 40% to about 75% by weight of polybutylene terephthalate,   (b) from about 0 to about 10% by weight of antimony trioxide,   (c) from about 0 to about 35% by weight of glass fiber, and   (d) from about 5% to about 20% by weight of a chlorinated bisimide of formula ##STR4##   
     
     
       2. The composition of claim 1 wherein the polybutylene terephthalate is present in an amount of from about 50% to about 60% by weight. 
     
     
       3. The composition of claim 1 wherein the chlorinated bisimide is present in an amount of from about 10% to about 15% by weight. 
     
     
       4. A molded article prepared from the composition of claim 1. 
     
     
       5. The article of claim 4 which is molded at a temperature in the range of from about 450° F. to about 500° F.